Smart Reply Service

Smart Reply Service is a backend service that generates context-aware reply drafts for messaging and support products. It keeps request shaping, response constraints, and service reliability in one place so suggestions can be integrated safely.

Reply generation is hard to maintain when prompt logic, context assembly, and delivery live inside the product codebase.

I separated the capability into a dedicated service with typed request contracts, prompt policies, and response guards for downstream integration.

Node.js / TypeScript / Fastify / Redis / OpenAI

• Built a stateless API layer with clear request and response schemas.
• Added prompt controls for tone, length, and exclusion rules.
• Used caching for repeated context assembly paths.
• Designed the service to plug into messaging and support workflows cleanly.